1 /* The industrial I/O core 2 * 3 * Copyright (c) 2008 Jonathan Cameron 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 as published by 7 * the Free Software Foundation. 8 * 9 * Based on elements of hwmon and input subsystems. 10 */ 11 12 #define pr_fmt(fmt) "iio-core: " fmt 13 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/idr.h> 17 #include <linux/kdev_t.h> 18 #include <linux/err.h> 19 #include <linux/device.h> 20 #include <linux/fs.h> 21 #include <linux/poll.h> 22 #include <linux/sched.h> 23 #include <linux/wait.h> 24 #include <linux/cdev.h> 25 #include <linux/slab.h> 26 #include <linux/anon_inodes.h> 27 #include <linux/debugfs.h> 28 #include <linux/mutex.h> 29 #include <linux/iio/iio.h> 30 #include "iio_core.h" 31 #include "iio_core_trigger.h" 32 #include <linux/iio/sysfs.h> 33 #include <linux/iio/events.h> 34 #include <linux/iio/buffer.h> 35 36 /* IDA to assign each registered device a unique id */ 37 static DEFINE_IDA(iio_ida); 38 39 static dev_t iio_devt; 40 41 #define IIO_DEV_MAX 256 42 struct bus_type iio_bus_type = { 43 .name = "iio", 44 }; 45 EXPORT_SYMBOL(iio_bus_type); 46 47 static struct dentry *iio_debugfs_dentry; 48 49 static const char * const iio_direction[] = { 50 [0] = "in", 51 [1] = "out", 52 }; 53 54 static const char * const iio_chan_type_name_spec[] = { 55 [IIO_VOLTAGE] = "voltage", 56 [IIO_CURRENT] = "current", 57 [IIO_POWER] = "power", 58 [IIO_ACCEL] = "accel", 59 [IIO_ANGL_VEL] = "anglvel", 60 [IIO_MAGN] = "magn", 61 [IIO_LIGHT] = "illuminance", 62 [IIO_INTENSITY] = "intensity", 63 [IIO_PROXIMITY] = "proximity", 64 [IIO_TEMP] = "temp", 65 [IIO_INCLI] = "incli", 66 [IIO_ROT] = "rot", 67 [IIO_ANGL] = "angl", 68 [IIO_TIMESTAMP] = "timestamp", 69 [IIO_CAPACITANCE] = "capacitance", 70 [IIO_ALTVOLTAGE] = "altvoltage", 71 [IIO_CCT] = "cct", 72 [IIO_PRESSURE] = "pressure", 73 [IIO_HUMIDITYRELATIVE] = "humidityrelative", 74 [IIO_ACTIVITY] = "activity", 75 [IIO_STEPS] = "steps", 76 [IIO_ENERGY] = "energy", 77 [IIO_DISTANCE] = "distance", 78 [IIO_VELOCITY] = "velocity", 79 [IIO_CONCENTRATION] = "concentration", 80 [IIO_RESISTANCE] = "resistance", 81 [IIO_PH] = "ph", 82 [IIO_UVINDEX] = "uvindex", 83 [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity", 84 }; 85 86 static const char * const iio_modifier_names[] = { 87 [IIO_MOD_X] = "x", 88 [IIO_MOD_Y] = "y", 89 [IIO_MOD_Z] = "z", 90 [IIO_MOD_X_AND_Y] = "x&y", 91 [IIO_MOD_X_AND_Z] = "x&z", 92 [IIO_MOD_Y_AND_Z] = "y&z", 93 [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z", 94 [IIO_MOD_X_OR_Y] = "x|y", 95 [IIO_MOD_X_OR_Z] = "x|z", 96 [IIO_MOD_Y_OR_Z] = "y|z", 97 [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z", 98 [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", 99 [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", 100 [IIO_MOD_LIGHT_BOTH] = "both", 101 [IIO_MOD_LIGHT_IR] = "ir", 102 [IIO_MOD_LIGHT_CLEAR] = "clear", 103 [IIO_MOD_LIGHT_RED] = "red", 104 [IIO_MOD_LIGHT_GREEN] = "green", 105 [IIO_MOD_LIGHT_BLUE] = "blue", 106 [IIO_MOD_LIGHT_UV] = "uv", 107 [IIO_MOD_QUATERNION] = "quaternion", 108 [IIO_MOD_TEMP_AMBIENT] = "ambient", 109 [IIO_MOD_TEMP_OBJECT] = "object", 110 [IIO_MOD_NORTH_MAGN] = "from_north_magnetic", 111 [IIO_MOD_NORTH_TRUE] = "from_north_true", 112 [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp", 113 [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp", 114 [IIO_MOD_RUNNING] = "running", 115 [IIO_MOD_JOGGING] = "jogging", 116 [IIO_MOD_WALKING] = "walking", 117 [IIO_MOD_STILL] = "still", 118 [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)", 119 [IIO_MOD_I] = "i", 120 [IIO_MOD_Q] = "q", 121 [IIO_MOD_CO2] = "co2", 122 [IIO_MOD_VOC] = "voc", 123 }; 124 125 /* relies on pairs of these shared then separate */ 126 static const char * const iio_chan_info_postfix[] = { 127 [IIO_CHAN_INFO_RAW] = "raw", 128 [IIO_CHAN_INFO_PROCESSED] = "input", 129 [IIO_CHAN_INFO_SCALE] = "scale", 130 [IIO_CHAN_INFO_OFFSET] = "offset", 131 [IIO_CHAN_INFO_CALIBSCALE] = "calibscale", 132 [IIO_CHAN_INFO_CALIBBIAS] = "calibbias", 133 [IIO_CHAN_INFO_PEAK] = "peak_raw", 134 [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale", 135 [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw", 136 [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw", 137 [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] 138 = "filter_low_pass_3db_frequency", 139 [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY] 140 = "filter_high_pass_3db_frequency", 141 [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency", 142 [IIO_CHAN_INFO_FREQUENCY] = "frequency", 143 [IIO_CHAN_INFO_PHASE] = "phase", 144 [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain", 145 [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis", 146 [IIO_CHAN_INFO_INT_TIME] = "integration_time", 147 [IIO_CHAN_INFO_ENABLE] = "en", 148 [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight", 149 [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight", 150 [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count", 151 [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time", 152 [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity", 153 [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio", 154 }; 155 156 /** 157 * iio_find_channel_from_si() - get channel from its scan index 158 * @indio_dev: device 159 * @si: scan index to match 160 */ 161 const struct iio_chan_spec 162 *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) 163 { 164 int i; 165 166 for (i = 0; i < indio_dev->num_channels; i++) 167 if (indio_dev->channels[i].scan_index == si) 168 return &indio_dev->channels[i]; 169 return NULL; 170 } 171 172 /* This turns up an awful lot */ 173 ssize_t iio_read_const_attr(struct device *dev, 174 struct device_attribute *attr, 175 char *buf) 176 { 177 return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); 178 } 179 EXPORT_SYMBOL(iio_read_const_attr); 180 181 static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id) 182 { 183 int ret; 184 const struct iio_event_interface *ev_int = indio_dev->event_interface; 185 186 ret = mutex_lock_interruptible(&indio_dev->mlock); 187 if (ret) 188 return ret; 189 if ((ev_int && iio_event_enabled(ev_int)) || 190 iio_buffer_enabled(indio_dev)) { 191 mutex_unlock(&indio_dev->mlock); 192 return -EBUSY; 193 } 194 indio_dev->clock_id = clock_id; 195 mutex_unlock(&indio_dev->mlock); 196 197 return 0; 198 } 199 200 /** 201 * iio_get_time_ns() - utility function to get a time stamp for events etc 202 * @indio_dev: device 203 */ 204 s64 iio_get_time_ns(const struct iio_dev *indio_dev) 205 { 206 struct timespec tp; 207 208 switch (iio_device_get_clock(indio_dev)) { 209 case CLOCK_REALTIME: 210 ktime_get_real_ts(&tp); 211 break; 212 case CLOCK_MONOTONIC: 213 ktime_get_ts(&tp); 214 break; 215 case CLOCK_MONOTONIC_RAW: 216 getrawmonotonic(&tp); 217 break; 218 case CLOCK_REALTIME_COARSE: 219 tp = current_kernel_time(); 220 break; 221 case CLOCK_MONOTONIC_COARSE: 222 tp = get_monotonic_coarse(); 223 break; 224 case CLOCK_BOOTTIME: 225 get_monotonic_boottime(&tp); 226 break; 227 case CLOCK_TAI: 228 timekeeping_clocktai(&tp); 229 break; 230 default: 231 BUG(); 232 } 233 234 return timespec_to_ns(&tp); 235 } 236 EXPORT_SYMBOL(iio_get_time_ns); 237 238 /** 239 * iio_get_time_res() - utility function to get time stamp clock resolution in 240 * nano seconds. 241 * @indio_dev: device 242 */ 243 unsigned int iio_get_time_res(const struct iio_dev *indio_dev) 244 { 245 switch (iio_device_get_clock(indio_dev)) { 246 case CLOCK_REALTIME: 247 case CLOCK_MONOTONIC: 248 case CLOCK_MONOTONIC_RAW: 249 case CLOCK_BOOTTIME: 250 case CLOCK_TAI: 251 return hrtimer_resolution; 252 case CLOCK_REALTIME_COARSE: 253 case CLOCK_MONOTONIC_COARSE: 254 return LOW_RES_NSEC; 255 default: 256 BUG(); 257 } 258 } 259 EXPORT_SYMBOL(iio_get_time_res); 260 261 static int __init iio_init(void) 262 { 263 int ret; 264 265 /* Register sysfs bus */ 266 ret = bus_register(&iio_bus_type); 267 if (ret < 0) { 268 pr_err("could not register bus type\n"); 269 goto error_nothing; 270 } 271 272 ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); 273 if (ret < 0) { 274 pr_err("failed to allocate char dev region\n"); 275 goto error_unregister_bus_type; 276 } 277 278 iio_debugfs_dentry = debugfs_create_dir("iio", NULL); 279 280 return 0; 281 282 error_unregister_bus_type: 283 bus_unregister(&iio_bus_type); 284 error_nothing: 285 return ret; 286 } 287 288 static void __exit iio_exit(void) 289 { 290 if (iio_devt) 291 unregister_chrdev_region(iio_devt, IIO_DEV_MAX); 292 bus_unregister(&iio_bus_type); 293 debugfs_remove(iio_debugfs_dentry); 294 } 295 296 #if defined(CONFIG_DEBUG_FS) 297 static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, 298 size_t count, loff_t *ppos) 299 { 300 struct iio_dev *indio_dev = file->private_data; 301 char buf[20]; 302 unsigned val = 0; 303 ssize_t len; 304 int ret; 305 306 ret = indio_dev->info->debugfs_reg_access(indio_dev, 307 indio_dev->cached_reg_addr, 308 0, &val); 309 if (ret) 310 dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); 311 312 len = snprintf(buf, sizeof(buf), "0x%X\n", val); 313 314 return simple_read_from_buffer(userbuf, count, ppos, buf, len); 315 } 316 317 static ssize_t iio_debugfs_write_reg(struct file *file, 318 const char __user *userbuf, size_t count, loff_t *ppos) 319 { 320 struct iio_dev *indio_dev = file->private_data; 321 unsigned reg, val; 322 char buf[80]; 323 int ret; 324 325 count = min_t(size_t, count, (sizeof(buf)-1)); 326 if (copy_from_user(buf, userbuf, count)) 327 return -EFAULT; 328 329 buf[count] = 0; 330 331 ret = sscanf(buf, "%i %i", ®, &val); 332 333 switch (ret) { 334 case 1: 335 indio_dev->cached_reg_addr = reg; 336 break; 337 case 2: 338 indio_dev->cached_reg_addr = reg; 339 ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, 340 val, NULL); 341 if (ret) { 342 dev_err(indio_dev->dev.parent, "%s: write failed\n", 343 __func__); 344 return ret; 345 } 346 break; 347 default: 348 return -EINVAL; 349 } 350 351 return count; 352 } 353 354 static const struct file_operations iio_debugfs_reg_fops = { 355 .open = simple_open, 356 .read = iio_debugfs_read_reg, 357 .write = iio_debugfs_write_reg, 358 }; 359 360 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) 361 { 362 debugfs_remove_recursive(indio_dev->debugfs_dentry); 363 } 364 365 static int iio_device_register_debugfs(struct iio_dev *indio_dev) 366 { 367 struct dentry *d; 368 369 if (indio_dev->info->debugfs_reg_access == NULL) 370 return 0; 371 372 if (!iio_debugfs_dentry) 373 return 0; 374 375 indio_dev->debugfs_dentry = 376 debugfs_create_dir(dev_name(&indio_dev->dev), 377 iio_debugfs_dentry); 378 if (indio_dev->debugfs_dentry == NULL) { 379 dev_warn(indio_dev->dev.parent, 380 "Failed to create debugfs directory\n"); 381 return -EFAULT; 382 } 383 384 d = debugfs_create_file("direct_reg_access", 0644, 385 indio_dev->debugfs_dentry, 386 indio_dev, &iio_debugfs_reg_fops); 387 if (!d) { 388 iio_device_unregister_debugfs(indio_dev); 389 return -ENOMEM; 390 } 391 392 return 0; 393 } 394 #else 395 static int iio_device_register_debugfs(struct iio_dev *indio_dev) 396 { 397 return 0; 398 } 399 400 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) 401 { 402 } 403 #endif /* CONFIG_DEBUG_FS */ 404 405 static ssize_t iio_read_channel_ext_info(struct device *dev, 406 struct device_attribute *attr, 407 char *buf) 408 { 409 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 410 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 411 const struct iio_chan_spec_ext_info *ext_info; 412 413 ext_info = &this_attr->c->ext_info[this_attr->address]; 414 415 return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); 416 } 417 418 static ssize_t iio_write_channel_ext_info(struct device *dev, 419 struct device_attribute *attr, 420 const char *buf, 421 size_t len) 422 { 423 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 424 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 425 const struct iio_chan_spec_ext_info *ext_info; 426 427 ext_info = &this_attr->c->ext_info[this_attr->address]; 428 429 return ext_info->write(indio_dev, ext_info->private, 430 this_attr->c, buf, len); 431 } 432 433 ssize_t iio_enum_available_read(struct iio_dev *indio_dev, 434 uintptr_t priv, const struct iio_chan_spec *chan, char *buf) 435 { 436 const struct iio_enum *e = (const struct iio_enum *)priv; 437 unsigned int i; 438 size_t len = 0; 439 440 if (!e->num_items) 441 return 0; 442 443 for (i = 0; i < e->num_items; ++i) 444 len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]); 445 446 /* replace last space with a newline */ 447 buf[len - 1] = '\n'; 448 449 return len; 450 } 451 EXPORT_SYMBOL_GPL(iio_enum_available_read); 452 453 ssize_t iio_enum_read(struct iio_dev *indio_dev, 454 uintptr_t priv, const struct iio_chan_spec *chan, char *buf) 455 { 456 const struct iio_enum *e = (const struct iio_enum *)priv; 457 int i; 458 459 if (!e->get) 460 return -EINVAL; 461 462 i = e->get(indio_dev, chan); 463 if (i < 0) 464 return i; 465 else if (i >= e->num_items) 466 return -EINVAL; 467 468 return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]); 469 } 470 EXPORT_SYMBOL_GPL(iio_enum_read); 471 472 ssize_t iio_enum_write(struct iio_dev *indio_dev, 473 uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, 474 size_t len) 475 { 476 const struct iio_enum *e = (const struct iio_enum *)priv; 477 unsigned int i; 478 int ret; 479 480 if (!e->set) 481 return -EINVAL; 482 483 for (i = 0; i < e->num_items; i++) { 484 if (sysfs_streq(buf, e->items[i])) 485 break; 486 } 487 488 if (i == e->num_items) 489 return -EINVAL; 490 491 ret = e->set(indio_dev, chan, i); 492 return ret ? ret : len; 493 } 494 EXPORT_SYMBOL_GPL(iio_enum_write); 495 496 static const struct iio_mount_matrix iio_mount_idmatrix = { 497 .rotation = { 498 "1", "0", "0", 499 "0", "1", "0", 500 "0", "0", "1" 501 } 502 }; 503 504 static int iio_setup_mount_idmatrix(const struct device *dev, 505 struct iio_mount_matrix *matrix) 506 { 507 *matrix = iio_mount_idmatrix; 508 dev_info(dev, "mounting matrix not found: using identity...\n"); 509 return 0; 510 } 511 512 ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv, 513 const struct iio_chan_spec *chan, char *buf) 514 { 515 const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *) 516 priv)(indio_dev, chan); 517 518 if (IS_ERR(mtx)) 519 return PTR_ERR(mtx); 520 521 if (!mtx) 522 mtx = &iio_mount_idmatrix; 523 524 return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n", 525 mtx->rotation[0], mtx->rotation[1], mtx->rotation[2], 526 mtx->rotation[3], mtx->rotation[4], mtx->rotation[5], 527 mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]); 528 } 529 EXPORT_SYMBOL_GPL(iio_show_mount_matrix); 530 531 /** 532 * of_iio_read_mount_matrix() - retrieve iio device mounting matrix from 533 * device-tree "mount-matrix" property 534 * @dev: device the mounting matrix property is assigned to 535 * @propname: device specific mounting matrix property name 536 * @matrix: where to store retrieved matrix 537 * 538 * If device is assigned no mounting matrix property, a default 3x3 identity 539 * matrix will be filled in. 540 * 541 * Return: 0 if success, or a negative error code on failure. 542 */ 543 #ifdef CONFIG_OF 544 int of_iio_read_mount_matrix(const struct device *dev, 545 const char *propname, 546 struct iio_mount_matrix *matrix) 547 { 548 if (dev->of_node) { 549 int err = of_property_read_string_array(dev->of_node, 550 propname, matrix->rotation, 551 ARRAY_SIZE(iio_mount_idmatrix.rotation)); 552 553 if (err == ARRAY_SIZE(iio_mount_idmatrix.rotation)) 554 return 0; 555 556 if (err >= 0) 557 /* Invalid number of matrix entries. */ 558 return -EINVAL; 559 560 if (err != -EINVAL) 561 /* Invalid matrix declaration format. */ 562 return err; 563 } 564 565 /* Matrix was not declared at all: fallback to identity. */ 566 return iio_setup_mount_idmatrix(dev, matrix); 567 } 568 #else 569 int of_iio_read_mount_matrix(const struct device *dev, 570 const char *propname, 571 struct iio_mount_matrix *matrix) 572 { 573 return iio_setup_mount_idmatrix(dev, matrix); 574 } 575 #endif 576 EXPORT_SYMBOL(of_iio_read_mount_matrix); 577 578 /** 579 * iio_format_value() - Formats a IIO value into its string representation 580 * @buf: The buffer to which the formatted value gets written 581 * @type: One of the IIO_VAL_... constants. This decides how the val 582 * and val2 parameters are formatted. 583 * @size: Number of IIO value entries contained in vals 584 * @vals: Pointer to the values, exact meaning depends on the 585 * type parameter. 586 * 587 * Return: 0 by default, a negative number on failure or the 588 * total number of characters written for a type that belongs 589 * to the IIO_VAL_... constant. 590 */ 591 ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals) 592 { 593 unsigned long long tmp; 594 bool scale_db = false; 595 596 switch (type) { 597 case IIO_VAL_INT: 598 return sprintf(buf, "%d\n", vals[0]); 599 case IIO_VAL_INT_PLUS_MICRO_DB: 600 scale_db = true; 601 case IIO_VAL_INT_PLUS_MICRO: 602 if (vals[1] < 0) 603 return sprintf(buf, "-%d.%06u%s\n", abs(vals[0]), 604 -vals[1], scale_db ? " dB" : ""); 605 else 606 return sprintf(buf, "%d.%06u%s\n", vals[0], vals[1], 607 scale_db ? " dB" : ""); 608 case IIO_VAL_INT_PLUS_NANO: 609 if (vals[1] < 0) 610 return sprintf(buf, "-%d.%09u\n", abs(vals[0]), 611 -vals[1]); 612 else 613 return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); 614 case IIO_VAL_FRACTIONAL: 615 tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]); 616 vals[1] = do_div(tmp, 1000000000LL); 617 vals[0] = tmp; 618 return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); 619 case IIO_VAL_FRACTIONAL_LOG2: 620 tmp = (s64)vals[0] * 1000000000LL >> vals[1]; 621 vals[1] = do_div(tmp, 1000000000LL); 622 vals[0] = tmp; 623 return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); 624 case IIO_VAL_INT_MULTIPLE: 625 { 626 int i; 627 int len = 0; 628 629 for (i = 0; i < size; ++i) 630 len += snprintf(&buf[len], PAGE_SIZE - len, "%d ", 631 vals[i]); 632 len += snprintf(&buf[len], PAGE_SIZE - len, "\n"); 633 return len; 634 } 635 default: 636 return 0; 637 } 638 } 639 EXPORT_SYMBOL_GPL(iio_format_value); 640 641 static ssize_t iio_read_channel_info(struct device *dev, 642 struct device_attribute *attr, 643 char *buf) 644 { 645 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 646 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 647 int vals[INDIO_MAX_RAW_ELEMENTS]; 648 int ret; 649 int val_len = 2; 650 651 if (indio_dev->info->read_raw_multi) 652 ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c, 653 INDIO_MAX_RAW_ELEMENTS, 654 vals, &val_len, 655 this_attr->address); 656 else 657 ret = indio_dev->info->read_raw(indio_dev, this_attr->c, 658 &vals[0], &vals[1], this_attr->address); 659 660 if (ret < 0) 661 return ret; 662 663 return iio_format_value(buf, ret, val_len, vals); 664 } 665 666 /** 667 * iio_str_to_fixpoint() - Parse a fixed-point number from a string 668 * @str: The string to parse 669 * @fract_mult: Multiplier for the first decimal place, should be a power of 10 670 * @integer: The integer part of the number 671 * @fract: The fractional part of the number 672 * 673 * Returns 0 on success, or a negative error code if the string could not be 674 * parsed. 675 */ 676 int iio_str_to_fixpoint(const char *str, int fract_mult, 677 int *integer, int *fract) 678 { 679 int i = 0, f = 0; 680 bool integer_part = true, negative = false; 681 682 if (fract_mult == 0) { 683 *fract = 0; 684 685 return kstrtoint(str, 0, integer); 686 } 687 688 if (str[0] == '-') { 689 negative = true; 690 str++; 691 } else if (str[0] == '+') { 692 str++; 693 } 694 695 while (*str) { 696 if ('0' <= *str && *str <= '9') { 697 if (integer_part) { 698 i = i * 10 + *str - '0'; 699 } else { 700 f += fract_mult * (*str - '0'); 701 fract_mult /= 10; 702 } 703 } else if (*str == '\n') { 704 if (*(str + 1) == '\0') 705 break; 706 else 707 return -EINVAL; 708 } else if (*str == '.' && integer_part) { 709 integer_part = false; 710 } else { 711 return -EINVAL; 712 } 713 str++; 714 } 715 716 if (negative) { 717 if (i) 718 i = -i; 719 else 720 f = -f; 721 } 722 723 *integer = i; 724 *fract = f; 725 726 return 0; 727 } 728 EXPORT_SYMBOL_GPL(iio_str_to_fixpoint); 729 730 static ssize_t iio_write_channel_info(struct device *dev, 731 struct device_attribute *attr, 732 const char *buf, 733 size_t len) 734 { 735 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 736 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); 737 int ret, fract_mult = 100000; 738 int integer, fract; 739 740 /* Assumes decimal - precision based on number of digits */ 741 if (!indio_dev->info->write_raw) 742 return -EINVAL; 743 744 if (indio_dev->info->write_raw_get_fmt) 745 switch (indio_dev->info->write_raw_get_fmt(indio_dev, 746 this_attr->c, this_attr->address)) { 747 case IIO_VAL_INT: 748 fract_mult = 0; 749 break; 750 case IIO_VAL_INT_PLUS_MICRO: 751 fract_mult = 100000; 752 break; 753 case IIO_VAL_INT_PLUS_NANO: 754 fract_mult = 100000000; 755 break; 756 default: 757 return -EINVAL; 758 } 759 760 ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract); 761 if (ret) 762 return ret; 763 764 ret = indio_dev->info->write_raw(indio_dev, this_attr->c, 765 integer, fract, this_attr->address); 766 if (ret) 767 return ret; 768 769 return len; 770 } 771 772 static 773 int __iio_device_attr_init(struct device_attribute *dev_attr, 774 const char *postfix, 775 struct iio_chan_spec const *chan, 776 ssize_t (*readfunc)(struct device *dev, 777 struct device_attribute *attr, 778 char *buf), 779 ssize_t (*writefunc)(struct device *dev, 780 struct device_attribute *attr, 781 const char *buf, 782 size_t len), 783 enum iio_shared_by shared_by) 784 { 785 int ret = 0; 786 char *name = NULL; 787 char *full_postfix; 788 sysfs_attr_init(&dev_attr->attr); 789 790 /* Build up postfix of <extend_name>_<modifier>_postfix */ 791 if (chan->modified && (shared_by == IIO_SEPARATE)) { 792 if (chan->extend_name) 793 full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", 794 iio_modifier_names[chan 795 ->channel2], 796 chan->extend_name, 797 postfix); 798 else 799 full_postfix = kasprintf(GFP_KERNEL, "%s_%s", 800 iio_modifier_names[chan 801 ->channel2], 802 postfix); 803 } else { 804 if (chan->extend_name == NULL || shared_by != IIO_SEPARATE) 805 full_postfix = kstrdup(postfix, GFP_KERNEL); 806 else 807 full_postfix = kasprintf(GFP_KERNEL, 808 "%s_%s", 809 chan->extend_name, 810 postfix); 811 } 812 if (full_postfix == NULL) 813 return -ENOMEM; 814 815 if (chan->differential) { /* Differential can not have modifier */ 816 switch (shared_by) { 817 case IIO_SHARED_BY_ALL: 818 name = kasprintf(GFP_KERNEL, "%s", full_postfix); 819 break; 820 case IIO_SHARED_BY_DIR: 821 name = kasprintf(GFP_KERNEL, "%s_%s", 822 iio_direction[chan->output], 823 full_postfix); 824 break; 825 case IIO_SHARED_BY_TYPE: 826 name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", 827 iio_direction[chan->output], 828 iio_chan_type_name_spec[chan->type], 829 iio_chan_type_name_spec[chan->type], 830 full_postfix); 831 break; 832 case IIO_SEPARATE: 833 if (!chan->indexed) { 834 WARN(1, "Differential channels must be indexed\n"); 835 ret = -EINVAL; 836 goto error_free_full_postfix; 837 } 838 name = kasprintf(GFP_KERNEL, 839 "%s_%s%d-%s%d_%s", 840 iio_direction[chan->output], 841 iio_chan_type_name_spec[chan->type], 842 chan->channel, 843 iio_chan_type_name_spec[chan->type], 844 chan->channel2, 845 full_postfix); 846 break; 847 } 848 } else { /* Single ended */ 849 switch (shared_by) { 850 case IIO_SHARED_BY_ALL: 851 name = kasprintf(GFP_KERNEL, "%s", full_postfix); 852 break; 853 case IIO_SHARED_BY_DIR: 854 name = kasprintf(GFP_KERNEL, "%s_%s", 855 iio_direction[chan->output], 856 full_postfix); 857 break; 858 case IIO_SHARED_BY_TYPE: 859 name = kasprintf(GFP_KERNEL, "%s_%s_%s", 860 iio_direction[chan->output], 861 iio_chan_type_name_spec[chan->type], 862 full_postfix); 863 break; 864 865 case IIO_SEPARATE: 866 if (chan->indexed) 867 name = kasprintf(GFP_KERNEL, "%s_%s%d_%s", 868 iio_direction[chan->output], 869 iio_chan_type_name_spec[chan->type], 870 chan->channel, 871 full_postfix); 872 else 873 name = kasprintf(GFP_KERNEL, "%s_%s_%s", 874 iio_direction[chan->output], 875 iio_chan_type_name_spec[chan->type], 876 full_postfix); 877 break; 878 } 879 } 880 if (name == NULL) { 881 ret = -ENOMEM; 882 goto error_free_full_postfix; 883 } 884 dev_attr->attr.name = name; 885 886 if (readfunc) { 887 dev_attr->attr.mode |= S_IRUGO; 888 dev_attr->show = readfunc; 889 } 890 891 if (writefunc) { 892 dev_attr->attr.mode |= S_IWUSR; 893 dev_attr->store = writefunc; 894 } 895 896 error_free_full_postfix: 897 kfree(full_postfix); 898 899 return ret; 900 } 901 902 static void __iio_device_attr_deinit(struct device_attribute *dev_attr) 903 { 904 kfree(dev_attr->attr.name); 905 } 906 907 int __iio_add_chan_devattr(const char *postfix, 908 struct iio_chan_spec const *chan, 909 ssize_t (*readfunc)(struct device *dev, 910 struct device_attribute *attr, 911 char *buf), 912 ssize_t (*writefunc)(struct device *dev, 913 struct device_attribute *attr, 914 const char *buf, 915 size_t len), 916 u64 mask, 917 enum iio_shared_by shared_by, 918 struct device *dev, 919 struct list_head *attr_list) 920 { 921 int ret; 922 struct iio_dev_attr *iio_attr, *t; 923 924 iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL); 925 if (iio_attr == NULL) 926 return -ENOMEM; 927 ret = __iio_device_attr_init(&iio_attr->dev_attr, 928 postfix, chan, 929 readfunc, writefunc, shared_by); 930 if (ret) 931 goto error_iio_dev_attr_free; 932 iio_attr->c = chan; 933 iio_attr->address = mask; 934 list_for_each_entry(t, attr_list, l) 935 if (strcmp(t->dev_attr.attr.name, 936 iio_attr->dev_attr.attr.name) == 0) { 937 if (shared_by == IIO_SEPARATE) 938 dev_err(dev, "tried to double register : %s\n", 939 t->dev_attr.attr.name); 940 ret = -EBUSY; 941 goto error_device_attr_deinit; 942 } 943 list_add(&iio_attr->l, attr_list); 944 945 return 0; 946 947 error_device_attr_deinit: 948 __iio_device_attr_deinit(&iio_attr->dev_attr); 949 error_iio_dev_attr_free: 950 kfree(iio_attr); 951 return ret; 952 } 953 954 static int iio_device_add_info_mask_type(struct iio_dev *indio_dev, 955 struct iio_chan_spec const *chan, 956 enum iio_shared_by shared_by, 957 const long *infomask) 958 { 959 int i, ret, attrcount = 0; 960 961 for_each_set_bit(i, infomask, sizeof(infomask)*8) { 962 if (i >= ARRAY_SIZE(iio_chan_info_postfix)) 963 return -EINVAL; 964 ret = __iio_add_chan_devattr(iio_chan_info_postfix[i], 965 chan, 966 &iio_read_channel_info, 967 &iio_write_channel_info, 968 i, 969 shared_by, 970 &indio_dev->dev, 971 &indio_dev->channel_attr_list); 972 if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) 973 continue; 974 else if (ret < 0) 975 return ret; 976 attrcount++; 977 } 978 979 return attrcount; 980 } 981 982 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, 983 struct iio_chan_spec const *chan) 984 { 985 int ret, attrcount = 0; 986 const struct iio_chan_spec_ext_info *ext_info; 987 988 if (chan->channel < 0) 989 return 0; 990 ret = iio_device_add_info_mask_type(indio_dev, chan, 991 IIO_SEPARATE, 992 &chan->info_mask_separate); 993 if (ret < 0) 994 return ret; 995 attrcount += ret; 996 997 ret = iio_device_add_info_mask_type(indio_dev, chan, 998 IIO_SHARED_BY_TYPE, 999 &chan->info_mask_shared_by_type); 1000 if (ret < 0) 1001 return ret; 1002 attrcount += ret; 1003 1004 ret = iio_device_add_info_mask_type(indio_dev, chan, 1005 IIO_SHARED_BY_DIR, 1006 &chan->info_mask_shared_by_dir); 1007 if (ret < 0) 1008 return ret; 1009 attrcount += ret; 1010 1011 ret = iio_device_add_info_mask_type(indio_dev, chan, 1012 IIO_SHARED_BY_ALL, 1013 &chan->info_mask_shared_by_all); 1014 if (ret < 0) 1015 return ret; 1016 attrcount += ret; 1017 1018 if (chan->ext_info) { 1019 unsigned int i = 0; 1020 for (ext_info = chan->ext_info; ext_info->name; ext_info++) { 1021 ret = __iio_add_chan_devattr(ext_info->name, 1022 chan, 1023 ext_info->read ? 1024 &iio_read_channel_ext_info : NULL, 1025 ext_info->write ? 1026 &iio_write_channel_ext_info : NULL, 1027 i, 1028 ext_info->shared, 1029 &indio_dev->dev, 1030 &indio_dev->channel_attr_list); 1031 i++; 1032 if (ret == -EBUSY && ext_info->shared) 1033 continue; 1034 1035 if (ret) 1036 return ret; 1037 1038 attrcount++; 1039 } 1040 } 1041 1042 return attrcount; 1043 } 1044 1045 /** 1046 * iio_free_chan_devattr_list() - Free a list of IIO device attributes 1047 * @attr_list: List of IIO device attributes 1048 * 1049 * This function frees the memory allocated for each of the IIO device 1050 * attributes in the list. 1051 */ 1052 void iio_free_chan_devattr_list(struct list_head *attr_list) 1053 { 1054 struct iio_dev_attr *p, *n; 1055 1056 list_for_each_entry_safe(p, n, attr_list, l) { 1057 kfree(p->dev_attr.attr.name); 1058 list_del(&p->l); 1059 kfree(p); 1060 } 1061 } 1062 1063 static ssize_t iio_show_dev_name(struct device *dev, 1064 struct device_attribute *attr, 1065 char *buf) 1066 { 1067 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 1068 return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name); 1069 } 1070 1071 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); 1072 1073 static ssize_t iio_show_timestamp_clock(struct device *dev, 1074 struct device_attribute *attr, 1075 char *buf) 1076 { 1077 const struct iio_dev *indio_dev = dev_to_iio_dev(dev); 1078 const clockid_t clk = iio_device_get_clock(indio_dev); 1079 const char *name; 1080 ssize_t sz; 1081 1082 switch (clk) { 1083 case CLOCK_REALTIME: 1084 name = "realtime\n"; 1085 sz = sizeof("realtime\n"); 1086 break; 1087 case CLOCK_MONOTONIC: 1088 name = "monotonic\n"; 1089 sz = sizeof("monotonic\n"); 1090 break; 1091 case CLOCK_MONOTONIC_RAW: 1092 name = "monotonic_raw\n"; 1093 sz = sizeof("monotonic_raw\n"); 1094 break; 1095 case CLOCK_REALTIME_COARSE: 1096 name = "realtime_coarse\n"; 1097 sz = sizeof("realtime_coarse\n"); 1098 break; 1099 case CLOCK_MONOTONIC_COARSE: 1100 name = "monotonic_coarse\n"; 1101 sz = sizeof("monotonic_coarse\n"); 1102 break; 1103 case CLOCK_BOOTTIME: 1104 name = "boottime\n"; 1105 sz = sizeof("boottime\n"); 1106 break; 1107 case CLOCK_TAI: 1108 name = "tai\n"; 1109 sz = sizeof("tai\n"); 1110 break; 1111 default: 1112 BUG(); 1113 } 1114 1115 memcpy(buf, name, sz); 1116 return sz; 1117 } 1118 1119 static ssize_t iio_store_timestamp_clock(struct device *dev, 1120 struct device_attribute *attr, 1121 const char *buf, size_t len) 1122 { 1123 clockid_t clk; 1124 int ret; 1125 1126 if (sysfs_streq(buf, "realtime")) 1127 clk = CLOCK_REALTIME; 1128 else if (sysfs_streq(buf, "monotonic")) 1129 clk = CLOCK_MONOTONIC; 1130 else if (sysfs_streq(buf, "monotonic_raw")) 1131 clk = CLOCK_MONOTONIC_RAW; 1132 else if (sysfs_streq(buf, "realtime_coarse")) 1133 clk = CLOCK_REALTIME_COARSE; 1134 else if (sysfs_streq(buf, "monotonic_coarse")) 1135 clk = CLOCK_MONOTONIC_COARSE; 1136 else if (sysfs_streq(buf, "boottime")) 1137 clk = CLOCK_BOOTTIME; 1138 else if (sysfs_streq(buf, "tai")) 1139 clk = CLOCK_TAI; 1140 else 1141 return -EINVAL; 1142 1143 ret = iio_device_set_clock(dev_to_iio_dev(dev), clk); 1144 if (ret) 1145 return ret; 1146 1147 return len; 1148 } 1149 1150 static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR, 1151 iio_show_timestamp_clock, iio_store_timestamp_clock); 1152 1153 static int iio_device_register_sysfs(struct iio_dev *indio_dev) 1154 { 1155 int i, ret = 0, attrcount, attrn, attrcount_orig = 0; 1156 struct iio_dev_attr *p; 1157 struct attribute **attr, *clk = NULL; 1158 1159 /* First count elements in any existing group */ 1160 if (indio_dev->info->attrs) { 1161 attr = indio_dev->info->attrs->attrs; 1162 while (*attr++ != NULL) 1163 attrcount_orig++; 1164 } 1165 attrcount = attrcount_orig; 1166 /* 1167 * New channel registration method - relies on the fact a group does 1168 * not need to be initialized if its name is NULL. 1169 */ 1170 if (indio_dev->channels) 1171 for (i = 0; i < indio_dev->num_channels; i++) { 1172 const struct iio_chan_spec *chan = 1173 &indio_dev->channels[i]; 1174 1175 if (chan->type == IIO_TIMESTAMP) 1176 clk = &dev_attr_current_timestamp_clock.attr; 1177 1178 ret = iio_device_add_channel_sysfs(indio_dev, chan); 1179 if (ret < 0) 1180 goto error_clear_attrs; 1181 attrcount += ret; 1182 } 1183 1184 if (indio_dev->event_interface) 1185 clk = &dev_attr_current_timestamp_clock.attr; 1186 1187 if (indio_dev->name) 1188 attrcount++; 1189 if (clk) 1190 attrcount++; 1191 1192 indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, 1193 sizeof(indio_dev->chan_attr_group.attrs[0]), 1194 GFP_KERNEL); 1195 if (indio_dev->chan_attr_group.attrs == NULL) { 1196 ret = -ENOMEM; 1197 goto error_clear_attrs; 1198 } 1199 /* Copy across original attributes */ 1200 if (indio_dev->info->attrs) 1201 memcpy(indio_dev->chan_attr_group.attrs, 1202 indio_dev->info->attrs->attrs, 1203 sizeof(indio_dev->chan_attr_group.attrs[0]) 1204 *attrcount_orig); 1205 attrn = attrcount_orig; 1206 /* Add all elements from the list. */ 1207 list_for_each_entry(p, &indio_dev->channel_attr_list, l) 1208 indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; 1209 if (indio_dev->name) 1210 indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; 1211 if (clk) 1212 indio_dev->chan_attr_group.attrs[attrn++] = clk; 1213 1214 indio_dev->groups[indio_dev->groupcounter++] = 1215 &indio_dev->chan_attr_group; 1216 1217 return 0; 1218 1219 error_clear_attrs: 1220 iio_free_chan_devattr_list(&indio_dev->channel_attr_list); 1221 1222 return ret; 1223 } 1224 1225 static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) 1226 { 1227 1228 iio_free_chan_devattr_list(&indio_dev->channel_attr_list); 1229 kfree(indio_dev->chan_attr_group.attrs); 1230 indio_dev->chan_attr_group.attrs = NULL; 1231 } 1232 1233 static void iio_dev_release(struct device *device) 1234 { 1235 struct iio_dev *indio_dev = dev_to_iio_dev(device); 1236 if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED)) 1237 iio_device_unregister_trigger_consumer(indio_dev); 1238 iio_device_unregister_eventset(indio_dev); 1239 iio_device_unregister_sysfs(indio_dev); 1240 1241 iio_buffer_put(indio_dev->buffer); 1242 1243 ida_simple_remove(&iio_ida, indio_dev->id); 1244 kfree(indio_dev); 1245 } 1246 1247 struct device_type iio_device_type = { 1248 .name = "iio_device", 1249 .release = iio_dev_release, 1250 }; 1251 1252 /** 1253 * iio_device_alloc() - allocate an iio_dev from a driver 1254 * @sizeof_priv: Space to allocate for private structure. 1255 **/ 1256 struct iio_dev *iio_device_alloc(int sizeof_priv) 1257 { 1258 struct iio_dev *dev; 1259 size_t alloc_size; 1260 1261 alloc_size = sizeof(struct iio_dev); 1262 if (sizeof_priv) { 1263 alloc_size = ALIGN(alloc_size, IIO_ALIGN); 1264 alloc_size += sizeof_priv; 1265 } 1266 /* ensure 32-byte alignment of whole construct ? */ 1267 alloc_size += IIO_ALIGN - 1; 1268 1269 dev = kzalloc(alloc_size, GFP_KERNEL); 1270 1271 if (dev) { 1272 dev->dev.groups = dev->groups; 1273 dev->dev.type = &iio_device_type; 1274 dev->dev.bus = &iio_bus_type; 1275 device_initialize(&dev->dev); 1276 dev_set_drvdata(&dev->dev, (void *)dev); 1277 mutex_init(&dev->mlock); 1278 mutex_init(&dev->info_exist_lock); 1279 INIT_LIST_HEAD(&dev->channel_attr_list); 1280 1281 dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); 1282 if (dev->id < 0) { 1283 /* cannot use a dev_err as the name isn't available */ 1284 pr_err("failed to get device id\n"); 1285 kfree(dev); 1286 return NULL; 1287 } 1288 dev_set_name(&dev->dev, "iio:device%d", dev->id); 1289 INIT_LIST_HEAD(&dev->buffer_list); 1290 } 1291 1292 return dev; 1293 } 1294 EXPORT_SYMBOL(iio_device_alloc); 1295 1296 /** 1297 * iio_device_free() - free an iio_dev from a driver 1298 * @dev: the iio_dev associated with the device 1299 **/ 1300 void iio_device_free(struct iio_dev *dev) 1301 { 1302 if (dev) 1303 put_device(&dev->dev); 1304 } 1305 EXPORT_SYMBOL(iio_device_free); 1306 1307 static void devm_iio_device_release(struct device *dev, void *res) 1308 { 1309 iio_device_free(*(struct iio_dev **)res); 1310 } 1311 1312 static int devm_iio_device_match(struct device *dev, void *res, void *data) 1313 { 1314 struct iio_dev **r = res; 1315 if (!r || !*r) { 1316 WARN_ON(!r || !*r); 1317 return 0; 1318 } 1319 return *r == data; 1320 } 1321 1322 /** 1323 * devm_iio_device_alloc - Resource-managed iio_device_alloc() 1324 * @dev: Device to allocate iio_dev for 1325 * @sizeof_priv: Space to allocate for private structure. 1326 * 1327 * Managed iio_device_alloc. iio_dev allocated with this function is 1328 * automatically freed on driver detach. 1329 * 1330 * If an iio_dev allocated with this function needs to be freed separately, 1331 * devm_iio_device_free() must be used. 1332 * 1333 * RETURNS: 1334 * Pointer to allocated iio_dev on success, NULL on failure. 1335 */ 1336 struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv) 1337 { 1338 struct iio_dev **ptr, *iio_dev; 1339 1340 ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr), 1341 GFP_KERNEL); 1342 if (!ptr) 1343 return NULL; 1344 1345 iio_dev = iio_device_alloc(sizeof_priv); 1346 if (iio_dev) { 1347 *ptr = iio_dev; 1348 devres_add(dev, ptr); 1349 } else { 1350 devres_free(ptr); 1351 } 1352 1353 return iio_dev; 1354 } 1355 EXPORT_SYMBOL_GPL(devm_iio_device_alloc); 1356 1357 /** 1358 * devm_iio_device_free - Resource-managed iio_device_free() 1359 * @dev: Device this iio_dev belongs to 1360 * @iio_dev: the iio_dev associated with the device 1361 * 1362 * Free iio_dev allocated with devm_iio_device_alloc(). 1363 */ 1364 void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev) 1365 { 1366 int rc; 1367 1368 rc = devres_release(dev, devm_iio_device_release, 1369 devm_iio_device_match, iio_dev); 1370 WARN_ON(rc); 1371 } 1372 EXPORT_SYMBOL_GPL(devm_iio_device_free); 1373 1374 /** 1375 * iio_chrdev_open() - chrdev file open for buffer access and ioctls 1376 * @inode: Inode structure for identifying the device in the file system 1377 * @filp: File structure for iio device used to keep and later access 1378 * private data 1379 * 1380 * Return: 0 on success or -EBUSY if the device is already opened 1381 **/ 1382 static int iio_chrdev_open(struct inode *inode, struct file *filp) 1383 { 1384 struct iio_dev *indio_dev = container_of(inode->i_cdev, 1385 struct iio_dev, chrdev); 1386 1387 if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) 1388 return -EBUSY; 1389 1390 iio_device_get(indio_dev); 1391 1392 filp->private_data = indio_dev; 1393 1394 return 0; 1395 } 1396 1397 /** 1398 * iio_chrdev_release() - chrdev file close buffer access and ioctls 1399 * @inode: Inode structure pointer for the char device 1400 * @filp: File structure pointer for the char device 1401 * 1402 * Return: 0 for successful release 1403 */ 1404 static int iio_chrdev_release(struct inode *inode, struct file *filp) 1405 { 1406 struct iio_dev *indio_dev = container_of(inode->i_cdev, 1407 struct iio_dev, chrdev); 1408 clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); 1409 iio_device_put(indio_dev); 1410 1411 return 0; 1412 } 1413 1414 /* Somewhat of a cross file organization violation - ioctls here are actually 1415 * event related */ 1416 static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 1417 { 1418 struct iio_dev *indio_dev = filp->private_data; 1419 int __user *ip = (int __user *)arg; 1420 int fd; 1421 1422 if (!indio_dev->info) 1423 return -ENODEV; 1424 1425 if (cmd == IIO_GET_EVENT_FD_IOCTL) { 1426 fd = iio_event_getfd(indio_dev); 1427 if (fd < 0) 1428 return fd; 1429 if (copy_to_user(ip, &fd, sizeof(fd))) 1430 return -EFAULT; 1431 return 0; 1432 } 1433 return -EINVAL; 1434 } 1435 1436 static const struct file_operations iio_buffer_fileops = { 1437 .read = iio_buffer_read_first_n_outer_addr, 1438 .release = iio_chrdev_release, 1439 .open = iio_chrdev_open, 1440 .poll = iio_buffer_poll_addr, 1441 .owner = THIS_MODULE, 1442 .llseek = noop_llseek, 1443 .unlocked_ioctl = iio_ioctl, 1444 .compat_ioctl = iio_ioctl, 1445 }; 1446 1447 static int iio_check_unique_scan_index(struct iio_dev *indio_dev) 1448 { 1449 int i, j; 1450 const struct iio_chan_spec *channels = indio_dev->channels; 1451 1452 if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES)) 1453 return 0; 1454 1455 for (i = 0; i < indio_dev->num_channels - 1; i++) { 1456 if (channels[i].scan_index < 0) 1457 continue; 1458 for (j = i + 1; j < indio_dev->num_channels; j++) 1459 if (channels[i].scan_index == channels[j].scan_index) { 1460 dev_err(&indio_dev->dev, 1461 "Duplicate scan index %d\n", 1462 channels[i].scan_index); 1463 return -EINVAL; 1464 } 1465 } 1466 1467 return 0; 1468 } 1469 1470 static const struct iio_buffer_setup_ops noop_ring_setup_ops; 1471 1472 /** 1473 * iio_device_register() - register a device with the IIO subsystem 1474 * @indio_dev: Device structure filled by the device driver 1475 **/ 1476 int iio_device_register(struct iio_dev *indio_dev) 1477 { 1478 int ret; 1479 1480 /* If the calling driver did not initialize of_node, do it here */ 1481 if (!indio_dev->dev.of_node && indio_dev->dev.parent) 1482 indio_dev->dev.of_node = indio_dev->dev.parent->of_node; 1483 1484 ret = iio_check_unique_scan_index(indio_dev); 1485 if (ret < 0) 1486 return ret; 1487 1488 /* configure elements for the chrdev */ 1489 indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); 1490 1491 ret = iio_device_register_debugfs(indio_dev); 1492 if (ret) { 1493 dev_err(indio_dev->dev.parent, 1494 "Failed to register debugfs interfaces\n"); 1495 return ret; 1496 } 1497 1498 ret = iio_buffer_alloc_sysfs_and_mask(indio_dev); 1499 if (ret) { 1500 dev_err(indio_dev->dev.parent, 1501 "Failed to create buffer sysfs interfaces\n"); 1502 goto error_unreg_debugfs; 1503 } 1504 1505 ret = iio_device_register_sysfs(indio_dev); 1506 if (ret) { 1507 dev_err(indio_dev->dev.parent, 1508 "Failed to register sysfs interfaces\n"); 1509 goto error_buffer_free_sysfs; 1510 } 1511 ret = iio_device_register_eventset(indio_dev); 1512 if (ret) { 1513 dev_err(indio_dev->dev.parent, 1514 "Failed to register event set\n"); 1515 goto error_free_sysfs; 1516 } 1517 if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED)) 1518 iio_device_register_trigger_consumer(indio_dev); 1519 1520 if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && 1521 indio_dev->setup_ops == NULL) 1522 indio_dev->setup_ops = &noop_ring_setup_ops; 1523 1524 cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); 1525 indio_dev->chrdev.owner = indio_dev->info->driver_module; 1526 indio_dev->chrdev.kobj.parent = &indio_dev->dev.kobj; 1527 ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1); 1528 if (ret < 0) 1529 goto error_unreg_eventset; 1530 1531 ret = device_add(&indio_dev->dev); 1532 if (ret < 0) 1533 goto error_cdev_del; 1534 1535 return 0; 1536 error_cdev_del: 1537 cdev_del(&indio_dev->chrdev); 1538 error_unreg_eventset: 1539 iio_device_unregister_eventset(indio_dev); 1540 error_free_sysfs: 1541 iio_device_unregister_sysfs(indio_dev); 1542 error_buffer_free_sysfs: 1543 iio_buffer_free_sysfs_and_mask(indio_dev); 1544 error_unreg_debugfs: 1545 iio_device_unregister_debugfs(indio_dev); 1546 return ret; 1547 } 1548 EXPORT_SYMBOL(iio_device_register); 1549 1550 /** 1551 * iio_device_unregister() - unregister a device from the IIO subsystem 1552 * @indio_dev: Device structure representing the device. 1553 **/ 1554 void iio_device_unregister(struct iio_dev *indio_dev) 1555 { 1556 mutex_lock(&indio_dev->info_exist_lock); 1557 1558 device_del(&indio_dev->dev); 1559 1560 if (indio_dev->chrdev.dev) 1561 cdev_del(&indio_dev->chrdev); 1562 iio_device_unregister_debugfs(indio_dev); 1563 1564 iio_disable_all_buffers(indio_dev); 1565 1566 indio_dev->info = NULL; 1567 1568 iio_device_wakeup_eventset(indio_dev); 1569 iio_buffer_wakeup_poll(indio_dev); 1570 1571 mutex_unlock(&indio_dev->info_exist_lock); 1572 1573 iio_buffer_free_sysfs_and_mask(indio_dev); 1574 } 1575 EXPORT_SYMBOL(iio_device_unregister); 1576 1577 static void devm_iio_device_unreg(struct device *dev, void *res) 1578 { 1579 iio_device_unregister(*(struct iio_dev **)res); 1580 } 1581 1582 /** 1583 * devm_iio_device_register - Resource-managed iio_device_register() 1584 * @dev: Device to allocate iio_dev for 1585 * @indio_dev: Device structure filled by the device driver 1586 * 1587 * Managed iio_device_register. The IIO device registered with this 1588 * function is automatically unregistered on driver detach. This function 1589 * calls iio_device_register() internally. Refer to that function for more 1590 * information. 1591 * 1592 * If an iio_dev registered with this function needs to be unregistered 1593 * separately, devm_iio_device_unregister() must be used. 1594 * 1595 * RETURNS: 1596 * 0 on success, negative error number on failure. 1597 */ 1598 int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev) 1599 { 1600 struct iio_dev **ptr; 1601 int ret; 1602 1603 ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL); 1604 if (!ptr) 1605 return -ENOMEM; 1606 1607 *ptr = indio_dev; 1608 ret = iio_device_register(indio_dev); 1609 if (!ret) 1610 devres_add(dev, ptr); 1611 else 1612 devres_free(ptr); 1613 1614 return ret; 1615 } 1616 EXPORT_SYMBOL_GPL(devm_iio_device_register); 1617 1618 /** 1619 * devm_iio_device_unregister - Resource-managed iio_device_unregister() 1620 * @dev: Device this iio_dev belongs to 1621 * @indio_dev: the iio_dev associated with the device 1622 * 1623 * Unregister iio_dev registered with devm_iio_device_register(). 1624 */ 1625 void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev) 1626 { 1627 int rc; 1628 1629 rc = devres_release(dev, devm_iio_device_unreg, 1630 devm_iio_device_match, indio_dev); 1631 WARN_ON(rc); 1632 } 1633 EXPORT_SYMBOL_GPL(devm_iio_device_unregister); 1634 1635 /** 1636 * iio_device_claim_direct_mode - Keep device in direct mode 1637 * @indio_dev: the iio_dev associated with the device 1638 * 1639 * If the device is in direct mode it is guaranteed to stay 1640 * that way until iio_device_release_direct_mode() is called. 1641 * 1642 * Use with iio_device_release_direct_mode() 1643 * 1644 * Returns: 0 on success, -EBUSY on failure 1645 */ 1646 int iio_device_claim_direct_mode(struct iio_dev *indio_dev) 1647 { 1648 mutex_lock(&indio_dev->mlock); 1649 1650 if (iio_buffer_enabled(indio_dev)) { 1651 mutex_unlock(&indio_dev->mlock); 1652 return -EBUSY; 1653 } 1654 return 0; 1655 } 1656 EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode); 1657 1658 /** 1659 * iio_device_release_direct_mode - releases claim on direct mode 1660 * @indio_dev: the iio_dev associated with the device 1661 * 1662 * Release the claim. Device is no longer guaranteed to stay 1663 * in direct mode. 1664 * 1665 * Use with iio_device_claim_direct_mode() 1666 */ 1667 void iio_device_release_direct_mode(struct iio_dev *indio_dev) 1668 { 1669 mutex_unlock(&indio_dev->mlock); 1670 } 1671 EXPORT_SYMBOL_GPL(iio_device_release_direct_mode); 1672 1673 subsys_initcall(iio_init); 1674 module_exit(iio_exit); 1675 1676 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); 1677 MODULE_DESCRIPTION("Industrial I/O core"); 1678 MODULE_LICENSE("GPL"); 1679